Cloth-cutting machine.



M. ARENDT. CLOTH CUTTING MACHINE. APPLICATION FILED 11:13.21, 1914.

Patented Jan. 19, 1915.

2 SHEETS-SHEET 1.

w//vEssEs M. ARENDT.

CLOTH CUTTING MACHINE.

APPLICATION FILED 1112.21, 1914.-

1,125,434, Patented Jan.1,1915.

2 SHEETS-SHEET 2.

WITNESSES citizen of the United States,

.imiTEiD sTATEs PATENT oEEioE.

NORTON ARENDT, 0F YORK, N. Y., ASSIG'NOR T0 MAIMIN IBRO'I'LHERSl AND COM-i PANY, A COPARTNEZRSHIP CONSISTING OF OF NEW YORK, N. Y.

DAVIS S. MAIMIN AND MEYER MAIMIN,

CLOTH-CUTTING MACHINE.

Specification of Letters Patent.

iatented Jan. 19, 1915.-

Appllcation led February 21, 1914. Serial No. $20,142.

To all whom it ma? concern.'

Be it known tiat I, Moa'roN ABENDT, a residing at The Ansonia, Broadway and Seventythird street, borough of Manhattan, city, county, and State of New York, have invented certain new and useful Improvements in Cloth-Cutting Machines; and I do hereby declare theV following to be afull,

clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and useI the same.'

The object of the invention is to provide a cloth-cutting machine adapted to cut lays of cloth of a depth greater than half the diameter of the rotary knife, with which it p will be easy to follow closely the pattern drawn or laid on the cloth, and which shall be compact and durable without exposed breakable parts. To this end, a large portion of the forward edge of the cutting knife is exposed to the view of the operator, and yet is completely guarded by a straight guard blade arranged in the plane of and in front of, but not covering, the exposed edge of )the knife; and the sharpening attachment, with which such devices are customa rily provided, is located inside of the guard and preferably out of the range of vision of the operator as his eye, follows the cut, that is to say, behind the guard and beneath the motor and lying within the upper forwit'h the knife, so as to avoid obstructing the view of the effective cutting edge of the knife by the perator and also to avoid engagement with'the top layer of cloth when the lay extends well above the center of the knife. Furthermore, the controlling switch for the electric driving motor is of the pushbutton type and is housed in the motor casing in proximity to the directing handle, so

that it is protected from injury and yet is conveniently operated to start and stop the motor. Y

vIn the accompanying drawing, illustrating the preferred embodiment of my invention, Figure l is a side'elevation of the complete machine, the motor casing being partly broken away to show the construcj tion and arrangement of the electric switch;

son of this fact the operator,

Fig. 2 is a section on the line 2--2 of Fig. 1,

with the armature of the motor and its shaft shown 1n elevation; Fig. 8 is a plan of the machine with the motor removed, showing' and lifts the cloth to the cutting-knife, and

from this foot rises a standard 2 constitutlng a support and shield for the knife 3 which is journaled therein, the standard being so shaped, as shown in Fig. l, that the greater part of the forward cutting edge of the knife is unobstructed and exposed to view for a considerable distance above the horizontal plane of the knife center, so as to permit the cutting of lays of cloth of greater depth than half the diameter of the knife. Upon the flat top plate 4 of the standard, the motor 5 is supported, and this plate also supports a guideway 6 for the straight knife guard blade 7 arranged in the plane of and in front of, but not covering the forward edge of the knife 3. The guard blade 7 may be locked in the desired position of adjustment by the thumb screw 8, and in order that the vblade may always move to the guarding position when the thumb screw is loosened, I attach the spring 9 at one en d to the guide and at the other end to the guard blade, so that its normal tendency is to depress the blade onto the cloth. It will be observed that the blade 7 has the u'pturned toe 10 facilitating the entry of the cloth between the blade and the shoe.

The constructionand arrangement of this guard blade constitute an important feature of my invention. The guard does not hide the forward edge of the knife, and by reawho sees a substantial portion of the blade above that portion which engages the cloth, is enabled to 4follow more accurately the line of the pattern. Furthermore, the thin blade-like form of the "guard assists rather than hinhousing of ders ai@ datetiws-aqa=cfggtne 9 ei-atm and at"the"'same"time gives' such' sti .ness to bent against the the guard that it cannot be blade 'by 'a-ny *hardblow.. The electric'm'otor 5 has vplug fepfmagnetic material which fits.. into -1 thezopeiring in the frame 11 and constltutes f a part ot the magnetic circuit. In -operatmg the switch, the depression of the pushbutton brings the contact: member 16 into contact with the two terminals 17, completing the electric circuit; andthe button is held in that position bythe spring pressed latch 18 (see Fig. 5); which has the linger piece 19' for the purposve of withdrawing the latch to permit the push-button to move to the open circuit position under the action of its spring 19. It will' be observed that the adoption of the push-button type of switch makes it possible .to house the switch within the motor cas1ng,"thus doing away with all i out lifting the ter. The Imech liability to injury and exposure to dirt, and

`at the same time the adoption of a magnetic plug as the face plate of the'switch prevents the disadvantageous reduction of the cross section of the magnetic linx path which would otherwise result. Furthermore, this arrangement and Alocation of the switch makes it conveniently operable by the thumb gf the operator who holds the directing han- It will beunde'rstood from F ig. 2 that the vertical shaft of the motor 5 drives directly through thel pinion 21 the rotatable circular cutting-knife 3, which bearings as shown. V

It is customary to provide-cloth-cutting machines of this character with sharpening grinder mechanism, usually in the form of a pair of grinders arranged to engage the cutting edge o f the knife to sharpen it. have `adopted la novel arrangement of this grinding mechanism which isV illustrated in Figs. 1, 3 and 4, and which has the advantage that the entire 'grinding mechanism is protected from'accidental injury and at the same time the grindstones may be brought by a slight and simple movement into contact with the edge of the blade withard, and are so `located as not to lie in the ine of vision of the' operator looking at the cu't, and not to detract his eye therefrom, and -furthermore will not come in contact with the cloth, even when the 1at. ter is arranged in layers extending well abovethe horizontal plane ofthe knife cen- 'sm comprises a pair of is .mounted ont ball ai@ yunaricufield magnet frame 11 constituting the motor poles 12 are located on" ver 31 which is pivot I ter,

mamas links 22, 23- 'pia'roted ,respectively atV the points 2l, 25 on'jlh'e top`pl'ate elA of the standard 2. Each these links carries a stud (26, 27) on which the grindstnes Q8, 29 are rotatably mounted in position in proximity to the cutting edge of/the knife, but the stones are normally held out of contact with that edge by the sprinlg 30 actirig on the lee, to the top'plate 4 at 32, and is connected atlone end to the link 22 and at the other end to the link 23 through the connecting link 33. l The lever 31 has an imity to the movement toward one another into contact with the cutting edge of. the knife to sharpen it. As soon as the handle 34 is released by the operator, the stones are thrown by the spring 30 into the'inoperativeposition. It will thus be seen that the grindstones and the operating mec anism therefor are completely concealed a motor, while the grmdstones themselves lie inside of the guard 7 within the lupper forward quadrant having a center coincident with the knife in a position such that a slight lateral movement will bring them into the sharpening position, and they are so far beneath themotor that the operators view of the cutting edge is not obstructed by them.4 1t will be further noted that the relative arrangement of the knife and the grindstones is such as to permit the operator to clearly view the cutting edge of the knife where .the latter engages the topmost layer of cloth, so that he may accurately follow the pattern, andalso rendersv feasible the economical and eilicient cutting of deep lays or multiple plies of cloth, extending well above the horizontal plane of the kni e ccnand furthermore, permits the grinding of the knife to be effected at all times, even during the operation of cutting the cloth, without requiring any movement of or interference with the guard, and also without obstructing the view of the effective cutting edge of the knife by the operator.

I claim: v y

1. A cloth-cutting machine having a foot, a knife-carrying standard rising from the foot, a circular cutting-knife journaled in the standard, a knife-driving motor supported on the standard, and knife-sharpening grinders concealed beneath the motor and adapted to be moved laterally toward each other into simultaneous contact with the edge of the knife'to sharpen it.

2. A cloth-cutting machine having a foot, a knife-carrying standard rising from the foot, a circular cutting-knife journaled in the standard, a knife-drivinglmotor supported on the standard, a straight knife-V d protected beneath the i guard supported in the plane of and in front of the knife, and knife-sharpening grinders independent of and lying inside the guard beneath the motor and adapted to be moved laterally toward each other into simultaneous contact with the edge of the knife to sharpen it.

3'. A cloth-cutting machine having a circular cutting-knife, a sharpenlng grinder therefor comprising a pair of grindstones normally lying on opposite sides of the knife in proximity to but separated from the edge thereof, and mechanism for movingfthe grindstones laterally toward each other into simultaneous :contact with the knife edge to sharpen it.

4. A cloth-cutting machine having a circular cutting-knife, a sharpening grinder therefor comprising a pair of grindstones normally lying on opposite sides of the knife in proximity to but separated from the edge thereofa system of links carryin said stones, and a trigger for actuating sai links to move the grindstoneslaterally into simultaneous contact with the knife edge to sharpen it.

A cloth-cutting machine having a circular cutting-knife, a sharpening grinder therefor comprising a pair of grindstones normally lying on opposite sides of the knife in proximity to but separated from the edge thereof, a system oflinks carryin said stones, a spring tending to hold the stones inthe said normal position, and a trigger for actuating said links to move the grindstones laterally into simultaneous contact with the knife edge to sharpen it.

6. A cloth-cutting maching having a circular cutting-knife, a knife-guard, a sharpening grinder comprising a pair of grindstones normally lying inside -of the guard on opposite sides of the knife in proximity to but separated from the edge thereof, and mechanism for moving the grindstones laterally toward each other into simultaneous contact with the knife edge to sharpen it.

7. A cloth-cutting machine having a foot, a knife-carrying standard rising from the foot, a circular cutting-knife journaled in the standard, a knife-driving motor supported on the standard, a sharpening grinder comprising a pair of grindstones normally lying concealed beneath the motor on opposite sides to the knife in proximity to but separated from the edge thereof, and mechanism for moving the grindstones laterally toward each other into simultaneous contact withl the knife edge to sharpen it.

t. A cloth-cutting machine having a foot, a. knife-carrying standard rising from the foot, a circular cutting-knife journaled in the standard, a knife-driving motor supported on the standard, a sharpening grinder comprising a pair 'of grindstones `on opposite sides to theknif a standard rising normally lying concealed beneath the motor e in proximity tobut separated from the edge thereof, and mechanism for moving the grindstones laterally toward cach other into simultaneous contact with the knife' edge to sharpen it, said mechanismy being likewise concealed beneath the motor. y

9, A cloth cutting machine having a foot, a standard rising from the foot, a knife 'driving motor supported on the standard, a

circular cutting knifel journaled in the standard and having an unobstructed cutting edge extending above the horizontal plane of its center and adapted to cut lays of cloth of a depth greater than half the diameter of the knife, a knife guard rigidly supported in front of the knife, and a knifesharpening grinder located inside the guard and beneath the motor and lying Within the upper forward quadrant having a center coincident with thfat of the knife, and means to move the grinder into and out of contact with the knife to sharpen the same.

10. A cloth cutting machine having a foot, from the foot, a knife driving motor supported on the standard, a circular cutting knife journaled in the standard and having an unobstructed cutting edge extending above the horizontal plane of its center and adapted to cut lays of cloth of a depth greater than half the diameter of the knife, a knife guard rigidly supported in front of the knife, and a pair of grindstones located inside the guard and beneath the motor and lying Within the upper forward quadrant having a center coincident with that of the knife, and means-to move the stones into and out of contact with the knife to sharpen the same. l

11. A cloth cutting machine having a foot, a standard rising from the foot, an electric motor supported on the standard, a circular cutting knife journaled in the standard and having an unobstructed cutting edge extending above the horizontal plane of its center and adapted to cut lays of cloth of a depth greater than half the diameter ofthe ife, gearing interposed between the motor and the knife axis, a knife guard rigidly supported in front of the knife, and a knife-sharpening grinder located inside the guard and beneath the motor, and lying Within the upper forward quadrant having a center coincident with that of the knife, and means to move the grinder into and out of contact with the knife to sharpen the same. i

12. A cloth-cutting machine having a directing handle, an electric driving motor, and a push-button motor-controlling switch housed in the motor frame in proximity to the handle.

13. A cloth-cutting machine having a diresting Handle,

vand. a push-button motor-controlling switch ture, in presencecof two witnesses. housed in the motor frame, the face-plate of said switch being a plug of magnetic ma- `Witnessesz Y 5 teri'al constituting a part of the magnetic v LEON W. RosEN'rHAL,

circuit of thelmotor. THEQDOBE HANSEN.

MORTON ARENDT. 

